Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efe98c83a84ba63…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 16:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a40220e0bac1ea4d316df0844105764 SHA-1: ad4053ccc6f082e84a9b98744ac8dcbd703041a7 SHA-256: 2efe98c83a84ba63d916cda9ac72c0684e3128fb0da72c5806a373ac1d78c310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. No scripts were extracted, but the nature of the embedded links suggests a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/loxonuvesetegaridul.pdf In PDF document text
    • http://fitviewer.biz/files/file/palafolifudugudopovijurid.pdfIn PDF document text
    • https://energooptima.hu/upload/File/64229540138.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/selufipakarulosagiwoku.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d80a2478c5f8e7248d67c3c079695d5a/bekujanidiwezexemojazu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/32140421390.pdfIn PDF document text
    • http://ty-int.com/files/files/82905965741.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be70837a7fe---domamupamod.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/453dc677f659f2c3087e8d6d7566cc07/13282884412.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/89739017743.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/62129528692.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/r5vds004o19fs83gqh4ddn418t/64072505478.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/gogokeraz.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/96744399147.pdfIn PDF document text
    • http://amdind.com/userfiles/file/zuvujexidozunafanatu.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/limipalaburupalokogonuxel.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/52927628283.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6a51b0589---27043943973.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/jomowesodajisejul.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf4904a16---19556196866.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969ec2128aa---38729706778.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/pegolufadozor.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779125dabec---zagujexutivavinufosuzida.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a1e5c34f5---papikarusidaxojomavogike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=generator+protection+relays+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD967 10764 bytes
SHA-256: 09586465920777bfb2c38b2b75cbc93ee363fd82ad17160d61e5e6760509a0dc
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 17260 bytes
SHA-256: fc2454a183f8df725b9bb417ed7a80ac12caea6dadbd474bd95b97572b9f40c2

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